Obc
abbr. outer back cover 封底; on board checkout 在板校验; oscillating Baffle column 振动挡板柱（塔）; old brutal convict 时间长而令人痛苦的肺病
🗣️ 情景例句
He is working like a horse.
他努力工作。
You should wear a sweater, It's cold today.
你应该穿一件毛衣，因为今天很冷。
Hello, Sam. Come in.
你好，萨姆。进来吧。